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-26-
No.EX##-OMO0004-A
Reference
No.
Problem
Possible cause
Investigation method
Countermeasure
Failure of the
power supply for
the master station
Confirm that power is supplied to the
master station
Supply power to the
master station correctly.
Check the DeviceNet
TM
cable is not
broken and confirm that the
connection between the cable and the
connector is not loose.
Confirm that repeated bending stress
or pulling forces which can cause a
broken wire is not applied to the cable.
Connect DeviceNet
TM
cable correctly.
Communication
line wiring failure
Confirm the DeviceNet
TM
cable wiring
is correct.
Wire correctly.
Communication
failure
Check that there is no equipment or
high voltage line that can generates
noise around the communication and
power supply lines.
Keep the DeviceNet
TM
cable and the power
supply cable away from
the noise source.
Check that there is no MAC ID
duplication between the master and
slaves.
Set MAC ID correctly
3
MNS LED is
OFF
MAC ID
duplication
Confirm that the communication speed
setting of the SI unit and the
communication speed setting of the
master and slave station are the same.
Set the communication
speed correctly.
MAC ID
duplication
Check that there is no MAC ID
duplication between the master and
slaves.
Set MAC ID correctly
Check the wiring length of the
communication line and the presence
of the termination resistors at both
ends of the DeviceNet
TM
network.
Wire and set correctly.
Check that there is no equipment or
high voltage line that can generates
noise around the communication and
power supply lines.
Keep the communication
and power supply cables
away from the noise
source.
Check the DeviceNet
TM
cable is not
broken and confirm that the
connection between the cable and the
connector is not loose.
Confirm that repeated bending stress
or pulling forces which can cause a
broken wire is not applied to the cable.
Connect DeviceNet
TM
cable correctly.
BUS OFF error
Confirm that the communication speed
setting of the SI unit and the
communication speed setting of the
master and slave station are the same.
Set the communication
speed correctly.
4
RUN LED is
red ON
Communication
device failure
Irrecoverable error occurrs to SI unit.
Replace the SI unit.